You probably will. The Penumbra games are pretty darn awesome. They won't make you ♥♥♥♥ your pants like Amnesia, but it still will freak you out a good amount. I thought the story was really good in Penumbra as well. The music is amazing and it's enviornment is pretty creepy. I'd say go for it.

Penumbra Overture - It's pretty good, but once you get a weapon, it's kind of loses its charm. Being defenseless really plays a huge role in horror games, it seems.

Penumbra Black Plague - Best Penumbra and probably the best horror title next to Amnesia and first two Silent Hills (my personal opinion). If you like horror, you will definitely enjoy it.

Penumbra Requiem - This is more of a puzzle in Penumbra universe, I personally found it boring and at times forced myself to play it. It's not scary and it requires you to think.

Fiend - Bet you didn't know about this one. Google it. It was released in 2001. I remember playing it back then, I was 12-13 years old. I got stuck at one part of the game and contacted Frictional Games to help me, they actually replied to my e-mail. :) Good guys. The game is 2D top-down and probably not everyone's cup of tea, but I found it pretty enjoyable, it has nice story.

Ya the Penumbra series is great I didn't finish Requiem, but up till there is pretty good. Btw in Overture when you do get a weapon the game is still scary because the weapons are pretty dodgy you're better off just running instead of fighting.